CN102041329A - LF (Ladle Furnace) hot steel slag recycling process - Google Patents
LF (Ladle Furnace) hot steel slag recycling process Download PDFInfo
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- CN102041329A CN102041329A CN2009101723878A CN200910172387A CN102041329A CN 102041329 A CN102041329 A CN 102041329A CN 2009101723878 A CN2009101723878 A CN 2009101723878A CN 200910172387 A CN200910172387 A CN 200910172387A CN 102041329 A CN102041329 A CN 102041329A
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- steel slag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The invention provides an LF (Ladle Furnace) hot steel slag recycling process. The process is characterized in that deslagging indicates that residual hot steel slag in a steel ladle is poured into molten steel of a steel ladle of a next ladle, and then refining raw materials are added, wherein the sulfur capacity of the residual hot steel slag is larger than 0.020. The steel slag poured in the past after refining is renewedly returned to the steel ladle for recycling, thus the physical heat of steel ladle poured allowance and the steel slag can be recovered, and the consumption of various raw materials of the LF is also saved, so that the process creates considerable economic benefits for steel enterprises, reduces the pollution of the hot steel slag to the environment, protects the ecological environment and realizes circular economic benefit.
Description
Technical field
The present invention relates to a kind of hot steel slag cycling and reutilization technology, especially a kind of LF stove hot steel slag cycling and reutilization technology is the improvement to LF stove refinery practice in the existing steel-smelting technology, belongs to the technical field of steelmaking and refining of metallurgy industry.
Background technology
Along with all trades and professions are more and more higher to the requirement of steel product quality, metallurgy industry adopts refining techniques more and more general in the steel-making link, the most frequently used refinery practice is a LF stove refinery practice, and this refinery practice flow process is: the steel melting furnace molten steel is tapped, and ladle----after the casting outwell residue slag in the ladle to carry out refining after adding refinery feedstock in the ladle by cast after the refining----.This LF stove refinery practice is all drained remaining refining slag after finishing the refining task, do not realize recycle, the discharging of hot refining slag is contaminate environment not only, and wasted heat, in addition behind the pouring molten steel, because the untimely steel that often waters by rule of thumb of ladle roughing slag proofing unit supply, ladle filling remaining liquid steel amount generally accounts for 1%～1.5% of whole stove molten steel.A large amount of hot steel slags is mixing up molten steel and is annotating the surplus dead slag ladle that not only welds easily, and influence is turnover normally, and has reduced recovery rate of iron, causes very big waste, has increased cost, is having a strong impact on economic benefit of enterprises.
Summary of the invention
Task of the present invention is that a kind of LF stove hot steel slag cycling and reutilization technology will be provided, the slag of outwelling after the refining in the past returned in the ladle again utilize again, because the slag after the refining of LF stove still has certain sulfur capacity, value basis with cycling and reutilization, hot steel slag not only can reclaim ladle and water surplus and physics heat slag, also can save the various raw material consumption of LF stove, for iron and steel enterprise creates considerable economic.
Task of the present invention is finished like this, a kind of LF stove hot steel slag cycling and reutilization technology, and it is made of following steps:
(1) the molten steel ladle of tapping; (2) refining; (3) casting; (4) deslagging; Be characterized in: described deslagging is that remaining hot steel slag is poured in the molten steel of next stove ladle in the ladle, adds refinery feedstock again.
Cycling and reutilization technology of the present invention, the sulfur capacity of the hot steel slag in the described deslagging is greater than 0.020.
Cycling and reutilization technology of the present invention, the sulfur capacity of the hot steel slag in the described deslagging is greater than 0.025.
Cycling and reutilization technology of the present invention, the process of remaining hot steel slag being poured into next stove ladle molten steel was less than 10 minutes.
Cycling and reutilization technology of the present invention, refining process must guarantee omnidistance blowing argon gas.The pressure of different steps is also different with traffic requirement, is specially: in (1) power supply stage, argon pressure is 0.4 MPa, argon flow amount be the 30-50 liter/minute; (2) levelling, the carburetting stage, argon pressure is the 0.6-0.8 MPa, argon flow amount be the 80-120 liter/minute; (3) feed a silk stage, argon pressure is 0.4 MPa, argon flow amount be the 30-50 liter/minute.
Cycling and reutilization technology of the present invention, the pressure of different steps argon gas and flow are preferably in the refining process: in (1) power supply stage, argon pressure is 0.4 MPa, argon flow amount be the 35-45 liter/minute; (2) levelling, the carburetting stage, argon pressure is the 0.65-0.75 MPa, argon flow amount be the 90-110 liter/minute; (3) feed a silk stage, argon pressure is 0.4 MPa, argon flow amount be the 35-45 liter/minute.
Cycling and reutilization technology of the present invention, the pressure of different steps argon gas and flow are preferably in the refining process: in (1) power supply stage, argon pressure is 0.4 MPa, and argon flow amount is 40 liters/minute; (2) levelling, carburetting stage, argon pressure is 0.7 MPa, and argon flow amount is 100 liters/minute; (3) feed the silk stage, argon pressure is 0.4 MPa, and argon flow amount is 40 liters/minute.
The refinery feedstock that the LF ladle refining furnace uses is: the calcium heart yearn of the aluminum steel of lime, fluorite, sweetening agent, silica flour, 10mm, 12mm, carburelant, refining slag, wrap heat preserving agent, iron alloy greatly.Cycling and reutilization technology of the present invention, the consumption of Wingdale and fluorite is 50% under not recycle of the hot steel slag situation in the refinery feedstock of adding.
The interior residue of ladle slag directly was blended into and prepares to carry out in the purified ladle after cycling and reutilization technology of the present invention will be cast, and method is simple.This technology is compared with technology in the past:
(1) because of having reclaimed the physics heat of slag, smelting cycle was controlled at below 26 minutes, and refining time shortens more than 3 minutes.
(2) because of having reclaimed the physics heat of slag, refining time shortens, and can reduce more than the power consumption 6 degree/tons.
(3) because of the slag that reclaims possesses recycle value, can reduce lime and fluorite add-on in the refinery feedstock, wherein lime consumption reduces more than the 4kg/ ton steel, and the fluorite consumption reduces more than the 0.5kg/ ton steel.
(4) hot steel slag because of recycle belongs to refining slag, through recycle, can cancel the higher finished product refining slag of price that adds outsourcing, has reduced production cost 2%-4%.
(5) because of the slag that reclaims is the slag preferably of deoxidation, can saves and smelt the various reductor add-ons of using in the steel, reduce production cost 0.5%-1%.
(6) the molten steel surplus in the recyclable ladle improves molten steel recovery rate 1%-2%.
Description of drawings
Fig. 1 represents LF stove hot steel slag cycling and reutilization process flow sheet of the present invention.
Embodiment
Embodiment 1
Present embodiment be in unwrap and water in the stove, after first Baogang's water has been cast, its sulfur capacity is 0.020 after testing, with the workshop overhead traveling crane ladle is hung oneself from the continuous caster universal stage, little hook on the overhead traveling crane is lived the ladle bottom web member, promote the little hook of overhead traveling crane ladle is tumbled, with remaining slag in the ladle with water surplus molten steel and all pour in another ladle behind the converter tapping.It is 8 minutes that ladle slag is hung down the back residence time from continuous casting, has avoided at the bottom of the sticking bag.Smelting cycle is controlled to be 24 minutes.
Carry out refining after adding refinery feedstock in this ladle, must guarantee in the refining process that omnidistance blowing argon gas wherein powers the stage, argon pressure is 0.4 MPa, and argon flow amount is 30 liters/minute; (2) levelling, carburetting stage, argon pressure is 0.8 MPa, 80 liters/minute of argon flow amounts; (3) feed the silk stage, argon pressure is 0.4 MPa, and argon flow amount is 30 liters/minute.The consumption of Wingdale and fluorite reduces 50% in the refinery feedstock that adds.
Cast after the refining, after the casting residue slag in the ladle according to circumstances also can repeatedly be utilized or outwell again.
Embodiment 2
Present embodiment be in unwrap and water in the stove, after first Baogang's water has been cast, its sulfur capacity is 0.025 after testing, with the workshop overhead traveling crane ladle is hung oneself from the continuous caster universal stage, little hook on the overhead traveling crane is lived the ladle bottom web member, promote the little hook of overhead traveling crane ladle is tumbled, with remaining slag in the ladle with water surplus molten steel and all pour in another ladle behind the converter tapping.It is 9 minutes that ladle slag is hung down the back residence time from continuous casting, has avoided at the bottom of the sticking bag.Smelting cycle is controlled to be 25 minutes.
Carry out refining after adding refinery feedstock in this ladle, must guarantee in the refining process that omnidistance blowing argon gas wherein powers the stage, argon pressure is 0.4 MPa, and argon flow amount is 40 liters/minute; (2) levelling, carburetting stage, argon pressure is 0.7 MPa, 100 liters/minute of argon flow amounts; (3) feed the silk stage, argon pressure is 0.4 MPa, and argon flow amount is 40 liters/minute.The consumption of Wingdale and fluorite reduces 50% in the refinery feedstock that adds.
Cast after the refining, after the casting residue slag in the ladle according to circumstances also can repeatedly be utilized or outwell again.
Embodiment 3
Present embodiment be in unwrap and water in the stove, after first Baogang's water has been cast, its sulfur capacity is 0.045 after testing, with the workshop overhead traveling crane ladle is hung oneself from the continuous caster universal stage, little hook on the overhead traveling crane is lived the ladle bottom web member, promote the little hook of overhead traveling crane ladle is tumbled, with remaining slag in the ladle with water surplus molten steel and all pour in another ladle behind the converter tapping.It is 9.5 minutes that ladle slag is hung down the back residence time from continuous casting, has avoided at the bottom of the sticking bag.Smelting cycle is controlled to be 23 minutes.
Carry out refining after adding refinery feedstock in this ladle, must guarantee in the refining process that omnidistance blowing argon gas wherein powers the stage, argon pressure is 0.4 MPa, and argon flow amount is 47 liters/minute; (2) levelling, carburetting stage, argon pressure is 0.7 MPa, 95 liters/minute of argon flow amounts; (3) feed the silk stage, argon pressure is 0.4 MPa, and argon flow amount is 42 liters/minute.The consumption of Wingdale and fluorite reduces 50% in the refinery feedstock that adds.
Cast after the refining, after the casting residue slag in the ladle according to circumstances also can repeatedly be utilized or outwell again.
Embodiment 4
Present embodiment be in unwrap and water in the stove, after first Baogang's water has been cast, its sulfur capacity is 0.055 after testing, with the workshop overhead traveling crane ladle is hung oneself from the continuous caster universal stage, little hook on the overhead traveling crane is lived the ladle bottom web member, promote the little hook of overhead traveling crane ladle is tumbled, with remaining slag in the ladle with water surplus molten steel and all pour in another ladle behind the converter tapping.It is 9.5 minutes that ladle slag is hung down the back residence time from continuous casting, has avoided at the bottom of the sticking bag.Smelting cycle is controlled to be 23 minutes.
Carry out refining after adding refinery feedstock in this ladle, must guarantee in the refining process that omnidistance blowing argon gas wherein powers the stage, argon pressure is 0.4 MPa, and argon flow amount is 45 liters/minute; (2) levelling, carburetting stage, argon pressure is 0.75 MPa, 90 liters/minute of argon flow amounts; (3) feed the silk stage, argon pressure is 0.4 MPa, and argon flow amount is 45 liters/minute.The consumption of Wingdale and fluorite reduces 50% in the refinery feedstock that adds.
Cast after the refining, after the casting residue slag in the ladle according to circumstances also can repeatedly be utilized or outwell again.
Claims (8)
1. LF stove hot steel slag cycling and reutilization technology, it is made of following steps: (1) molten steel ladle of tapping; (2) refining; (3) casting; (4) deslagging; It is characterized in that: described deslagging is that remaining hot steel slag is poured in the molten steel of next stove ladle in the ladle, adds refinery feedstock again.
2. LF stove hot steel slag cycling and reutilization technology as claimed in claim 1, it is characterized in that: the sulfur capacity of the hot steel slag in the described deslagging is greater than 0.020.
3. LF stove hot steel slag cycling and reutilization technology as claimed in claim 2, it is characterized in that: the sulfur capacity of the hot steel slag in the described deslagging is greater than 0.025.
4. LF stove hot steel slag cycling and reutilization technology as claimed in claim 2, it is characterized in that: in the described deslagging, the process of remaining hot steel slag being poured into next stove ladle molten steel was less than 10 minutes.
5. as claim 1 or 3 or 4 described LF stove hot steel slag cycling and reutilization technologies, it is characterized in that: the omnidistance blowing argon gas of refining process, the argon pressure and the traffic requirement of different steps are specially: in (1) power supply stage, argon pressure is 0.4 MPa, argon flow amount be the 30-50 liter/minute; (2) levelling, the carburetting stage, argon pressure is the 0.6-0.8 MPa, argon flow amount be the 80-120 liter/minute; (3) feed a silk stage, argon pressure is 0.4 MPa, argon flow amount be the 30-50 liter/minute.
6. LF stove hot steel slag cycling and reutilization technology as claimed in claim 5, it is characterized in that: the omnidistance blowing argon gas of refining process, the argon pressure and the traffic requirement of different steps are specially: in (1) power supply stage, argon pressure is 0.4 MPa, argon flow amount be the 35-45 liter/minute; (2) levelling, the carburetting stage, argon pressure is the 0.65-0.75 MPa, argon flow amount be the 90-110 liter/minute; (3) feed a silk stage, argon pressure is 0.4 MPa, argon flow amount be the 35-45 liter/minute.
7. LF stove hot steel slag cycling and reutilization technology as claimed in claim 6, it is characterized in that: the omnidistance blowing argon gas of refining process, the argon pressure and the traffic requirement of different steps are specially: in (1) power supply stage, argon pressure is 0.4 MPa, and argon flow amount is 40 liters/minute; (2) levelling, carburetting stage, argon pressure is 0.7 MPa, and argon flow amount is 100 liters/minute; (3) feed the silk stage, argon pressure is 0.4 MPa, and argon flow amount is 40 liters/minute.
8. LF stove hot steel slag cycling and reutilization technology as claimed in claim 1 is characterized in that: the consumption of Wingdale and fluorite is 50% under not recycle of the hot steel slag situation in the refinery feedstock of adding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101723878A CN102041329B (en) | 2009-10-12 | 2009-10-12 | LF (Ladle Furnace) hot steel slag recycling process |
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| CN2009101723878A CN102041329B (en) | 2009-10-12 | 2009-10-12 | LF (Ladle Furnace) hot steel slag recycling process |
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| CN102041329A true CN102041329A (en) | 2011-05-04 |
| CN102041329B CN102041329B (en) | 2012-07-04 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676743A (en) * | 2012-05-23 | 2012-09-19 | 莱芜钢铁集团有限公司 | Step-by-step returning recycling method of LF (Lactoferrin) refining slag in thermal state |
| CN102766725A (en) * | 2012-08-02 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Thermal state utilization method of stainless steel continuous casting residue |
| CN103045802A (en) * | 2012-12-21 | 2013-04-17 | 山西新泰钢铁有限公司 | Method for reducing energy consumption per ton steel |
| CN103834763A (en) * | 2014-01-28 | 2014-06-04 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Cyclic smelting method of high-carbon steel refining hot slag |
| CN103966395A (en) * | 2014-05-15 | 2014-08-06 | 邢台钢铁有限责任公司 | Utilization method of aluminum-killed steel casting residue in stainless steel production |
| CN105969943A (en) * | 2016-06-30 | 2016-09-28 | 山东钢铁股份有限公司 | Short process method of recycling LF liquid refining slag in thermal-state steel ladle |
| CN107586916A (en) * | 2017-08-31 | 2018-01-16 | 日照钢铁控股集团有限公司 | High silicon discards recycling method of the refining slag in low silicon Aluminum steel |
| CN107858485A (en) * | 2017-10-20 | 2018-03-30 | 芜湖新兴铸管有限责任公司 | Refine the circulation utilization method of warm sludge |
| CN109207674A (en) * | 2018-09-21 | 2019-01-15 | 山西通才工贸有限公司 | A method of accelerating the refining of 30MnSi |
| CN109880971A (en) * | 2019-04-03 | 2019-06-14 | 辽宁科技大学 | A kind of method of LF furnace refining slag molten state cycling and reutilization |
| CN110724782A (en) * | 2019-10-12 | 2020-01-24 | 南京钢铁股份有限公司 | Method for recycling residual steel and acid slag of cord steel |
-
2009
- 2009-10-12 CN CN2009101723878A patent/CN102041329B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102676743B (en) * | 2012-05-23 | 2016-04-20 | 莱芜钢铁集团有限公司 | The hot refining slag of LF returns circulation utilization method step by step |
| CN102676743A (en) * | 2012-05-23 | 2012-09-19 | 莱芜钢铁集团有限公司 | Step-by-step returning recycling method of LF (Lactoferrin) refining slag in thermal state |
| CN102766725A (en) * | 2012-08-02 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Thermal state utilization method of stainless steel continuous casting residue |
| CN103045802A (en) * | 2012-12-21 | 2013-04-17 | 山西新泰钢铁有限公司 | Method for reducing energy consumption per ton steel |
| CN103834763A (en) * | 2014-01-28 | 2014-06-04 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Cyclic smelting method of high-carbon steel refining hot slag |
| CN103966395B (en) * | 2014-05-15 | 2015-10-21 | 邢台钢铁有限责任公司 | Aluminium killed steel waters the Application way of recrement in stainless steel is produced |
| CN103966395A (en) * | 2014-05-15 | 2014-08-06 | 邢台钢铁有限责任公司 | Utilization method of aluminum-killed steel casting residue in stainless steel production |
| CN105969943A (en) * | 2016-06-30 | 2016-09-28 | 山东钢铁股份有限公司 | Short process method of recycling LF liquid refining slag in thermal-state steel ladle |
| CN107586916A (en) * | 2017-08-31 | 2018-01-16 | 日照钢铁控股集团有限公司 | High silicon discards recycling method of the refining slag in low silicon Aluminum steel |
| CN107586916B (en) * | 2017-08-31 | 2019-05-24 | 日照钢铁控股集团有限公司 | High silicon discards recycling and reusing method of the refining slag in low silicon Aluminum steel |
| CN107858485A (en) * | 2017-10-20 | 2018-03-30 | 芜湖新兴铸管有限责任公司 | Refine the circulation utilization method of warm sludge |
| CN109207674A (en) * | 2018-09-21 | 2019-01-15 | 山西通才工贸有限公司 | A method of accelerating the refining of 30MnSi |
| CN109880971A (en) * | 2019-04-03 | 2019-06-14 | 辽宁科技大学 | A kind of method of LF furnace refining slag molten state cycling and reutilization |
| CN110724782A (en) * | 2019-10-12 | 2020-01-24 | 南京钢铁股份有限公司 | Method for recycling residual steel and acid slag of cord steel |
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|---|---|
| CN102041329B (en) | 2012-07-04 |
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